6) this island in san francisco bay was used as an immigration station in the first half of the 20th century.

Angel island

EXPLANATION

Angel Island Immigration Station was an immigration station located in San Francisco Bay which operated from January 21, 1910 to November 5, 1940, where immigrants entering the United States were detained and interrogated. Angel Island is an island in San Francisco Bay

i think it would be a

keeping a cash reserve because cash flow is the the movement of money through a company and if it just sits there, it wont the movement